What action should be taken when an operator sees a red signal ahead?

When an operator sees a red signal ahead, the appropriate action is to prepare to stop the train. A red signal is a clear indication that the track ahead is not clear or that a stop is required, often due to an obstruction, another train, or a switch that is not set for the forward route.

In operating procedures, encountering a red signal prompts immediate action to ensure safety. Preparing to stop allows the operator to take the necessary measures to bring the train to a halt before reaching the signal's danger point, thereby preventing potential accidents and ensuring compliance with safety regulations. This preparation involves applying the brakes in a controlled manner and being aware of the surrounding conditions and the stopping distance required.

This response aligns with the fundamental safety protocols in train operations, which prioritize maintaining a safe operating environment and adhering to signal indications at all times.